Patent Number: 6,309,570

Title: Vacuum extrusion system for production of cement-based articles

Abstract: A system for making extruded cement-based articles. The process can include forming a cement-based feed mixture including water, aggregate and binder and directing the feed mixture to a vacuum zone, wherein sufficient vacuum is maintained in the vacuum zone to remove entrained air and, preferably, excess water, from the feed mixture. The feed mixture is held in the vacuum zone at a negative pressure for a time sufficient to form a vacuum-treated or densified mixture. The vacuum-treated or densified mixture is passed through an extruder at an elevated pressure to provide an extruded cement-based article.

Inventors: Fellabaum; Terence J. (Hartland, WI)

Assignee: American Equipment Systems

International Classification: B29C 47/50 (20060101); B29C 47/76 (20060101); B29C 47/38 (20060101); B28C 5/00 (20060101); B28C 5/46 (20060101); B28C 7/12 (20060101); B28B 3/20 (20060101); B28B 3/26 (20060101); B28C 7/00 (20060101); B28C 7/02 (20060101); B28B 001/087 (); B28B 003/22 (); B28B 003/26 (); B28C 007/12 (); B29C 047/76 ()

Expiration Date: 10/30/2018